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Use the interactive map below to check population changes. Zoom in to see where Podocnemis unilfilis is Endangered based on IUCN Redlist criteria - A3bd.

This is an extension of Norris et. al. 2019 that includes:

  • Stochastic population projections.
  • Future impacts to populations caused by human acessibility (hunting and habitat change) and actions that reduce river connectivity.

Map

Due to the number of points, the map can become slow to respond when you zoom in. Zoom out to a level showing fewer points and you can pan around the map to find the area of interest. Then zoom in again to check the coloured points.

Free-flowing rivers

When you zoom in you will see shaded points. Points are brown where populations are expected to decline by 50% or more within 3 generations (42 years). Brown points therefore represent rivers where the species is Endangered, following the IUCN Redlist criteria - A3bd.

River points Norris et. al. 2019

Map below uses the river points from Norris et. al. 2019.

When you zoom in you will see shaded points. Points are brown where populations are expected to decline by 50% or more within 3 generations (42 years). Brown points therefore represent rivers where the species is Endangered, following the IUCN Redlist criteria - A3bd.

Tables

A summary of the results is presented below. Summaries by country and major basin.

Summary by country.

Country Accessible Endangered (prop) river length (km) length End. length not End. Free Flowing (prop) length ff length not ff
Bolivia no 0 1641 0 1641 1.00 1641 0
Bolivia yes 1 17098 17098 0 0.98 16735 363
Brazil no 0 30758 0 30758 0.98 30253 505
Brazil yes 1 92740 92740 0 0.93 86027 6713
Colombia no 0 6771 0 6771 1.00 6771 0
Colombia yes 1 11266 11266 0 0.98 11045 221
Ecuador no 0 154 0 154 1.00 154 0
Ecuador yes 1 3176 3176 0 1.00 3169 7
French Guiana no 0 443 0 443 1.00 443 0
French Guiana yes 1 1390 1390 0 0.89 1239 151
Guyana no 0 1403 0 1403 1.00 1403 0
Guyana yes 1 3272 3272 0 1.00 3272 0
Peru no 0 2143 0 2143 1.00 2143 0
Peru yes 1 21304 21304 0 1.00 21266 38
Suriname no 0 1805 0 1805 1.00 1805 0
Suriname yes 1 2103 2103 0 0.89 1869 234
Venezuela no 0 5759 0 5759 0.97 5604 155
Venezuela yes 1 12623 12623 0 0.78 9889 2734
Total 215849 164972 50877 204728 11121

Summary by basin.

Using results from updated Norris et. al. 2019.

Basin Endangered (prop) river length (km) length End. length not End.
Amazon 0.77 170905 131958 38947
Coastal North 0.68 12700 8626 4074
Coastal South 1.00 5711 5711 0
Orinoco 0.70 26533 18677 7856

Same using Free-flowing rivers data.

Basin Endangered (prop) river length (km) length End. length not End.
Amazon 0.72 280121 202508 77613
Coastal North 0.52 20835 10879 9956
Coastal South 1.00 6467 6467 0
Orinoco 0.64 46014 29533 16481

Summary by major basins and countries.

Basin Country Endangered (prop) river length (km) length End. length not End.
Amazon Bolivia 0.91 18739 17098 1641
Amazon Brazil 0.74 116106 85750 30356
Amazon Colombia 0.54 7769 4229 3540
Amazon Ecuador 0.95 3330 3176 154
Amazon Guyana 1.00 299 299 0
Amazon Peru 0.91 23447 21304 2143
Amazon Venezuela 0.08 1215 102 1113
Coastal North Brazil 0.76 1681 1279 402
Coastal North French Guiana 0.76 1833 1390 443
Coastal North Guyana 0.68 4376 2973 1403
Coastal North Suriname 0.54 3908 2103 1805
Coastal North Venezuela 0.98 902 881 21
Coastal South Brazil 1.00 5711 5711 0
Orinoco Colombia 0.69 10268 7037 3231
Orinoco Venezuela 0.72 16265 11640 4625

Same with Free-flowing rivers…..

Basin Country Endangered (prop) river length (km) length End. length not End.
Amazon Bolivia 0.70 22217 15516 6701
Amazon Brazil 0.73 180434 132296 48138
Amazon Colombia 0.53 18687 9874 8813
Amazon Ecuador 0.85 8302 7066 1236
Amazon Guyana 1.00 423 423 0
Amazon Peru 0.78 47363 36750 10613
Amazon Venezuela 0.22 2695 583 2112
Coastal North Brazil 0.66 3653 2421 1232
Coastal North French Guiana 0.63 3297 2081 1216
Coastal North Guyana 0.41 6928 2867 4061
Coastal North Suriname 0.46 5756 2643 3113
Coastal North Venezuela 0.72 1201 867 334
Coastal South Brazil 1.00 6466 6466 0
Coastal South French Guiana 1.00 1 1 0
Orinoco Brazil 0.00 2 0 2
Orinoco Colombia 0.72 19865 14248 5617
Orinoco Guyana 1.00 21 21 0
Orinoco Venezuela 0.58 26126 15264 10862

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